[quote author="Ruzik" date="1329709495"]No no, you dont understud:
I need to do some item of QTreeView unvisible, you offer do QTreeView unvisible[/quote]
Then, your formulation of your question was off, because you clearly asked for both:

[quote author="Ruzik" date="1329677314"]How can i make item of QTreeView or QStandartItem unvisible?
[/quote]

Anyway, as koahnig already said: items in an item view don't have a visible property or something like that. You therefore have two options:

Remove the item in question from your model

Use a SortFilterProxyModel between your model and your view, and filter out the item in question.